White manages to find counterplay.
17... c7c5 Black starts a pawn advance on the queenside. White's position is very unpleasant. 18. d1f1 The old problem of which rook to move. Keymer probably considered it would be useful to give the king some space in case it needs to run from the attack, but the rook was useful on d1. 18... c5c4  19. b3d2  19... e7c5 Protecting the pawn and preparing b5-b4, but there's a better move with the same idea.